The quote in the title come from the poet Ezra Pound. It's a fascinating definition. What are we waiting for? As Christians, we are indeed waiting for Christ, the one who frees us. Thus we're slaves of Christ, as St. Paul describes.
But what defines the person who is not waiting for anyone to free him? Hopeless. One could even call this person lifeless.
The issue is, do we look to situations and circumstances to rescue us from the feeling of restlessness and dissatisfaction we experience in front of any limited object? Or do we rather settle for something less -- for material comfort, for power, for the regard of others, from the dream of our own moral consistency?
In only one case is this point in the circle [the human being in the immensity of the cosmos], this single human being, free from the entire world, free, so that the world together and even the total universe cannot force him to do anything...This is when we assume that this point is not totally the fruit of the biology of the mother and father, not strictly derived from the biological tradition of mechanical antecedents but rather when it possesses a direct relationship with the infinite, the origin of all the flux of the world, of the whole “circle,” ... that is to say, it is endowed with something derived from God...So here is the paradox: freedom is dependence on God. It is a paradox, but it is absolutely clear. The human being – the concrete human person, me, you – once we were not, now we are, and tomorrow will no longer be: thus we depend. And either we depend upon the flux of our material antecedents, and are consequently slaves of the powers that be, or we depend on What lies at the origin of the movement of all things, beyond them, which is to say, God. (Luigi Giussani, The Religious Sense, page 91)If we are not waiting for God to free us, and yet we're still waiting and open, then we will indeed be slaves of whomever holds power -- be they peers with forceful personalities, overbearing supervisors, critics (if we're artists), popular opinion (if we're politicians), rules and regulations and even points of etiquette that define every sphere of life. Even the masters, in this scenario, are slaves.